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6 Best Fuel Injector Cleaners Review 2021

Best Fuel Injector Cleaners

Emissions are one of the top pollutants around. Sadly, it’s inevitable, unavoidable gunk. It’s always going to be part of the system that manufactures cars powered by gasoline.

The good news is fuel efficiency laws and modern fuel systems today have evolved to minimize such emissions and hopefully, make today’s driving a lot more environmental-friendly.

In fact, I personally consider it a moral obligation for us drivers to do our part. Much of this responsibility stems out from the level of maintenance we provide our vehicles with, particularly in your fuel injection system.

Take a look at these best fuel injector cleaners that are guaranteed to keep your vehicle in top shape and help it perform excellently for many years to come. I’ve also added a helpful buying guide at the end and answered all your questions when it comes to fuel injector cleaners.

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The Best Fuel Injector (System) Cleaners Review

Below are some of the best cleaners you can find in just about any car shop around. Remember to consider not only the cost but also its cleaning potency as well as its adaptability with your car’s make and model.

1. Red Line (60103) Complete SI-1 Fuel System Cleaner

Red Line (60103) Complete SI-1 Fuel System Cleaner

Taking the top spot as the best fuel injector cleaner and one that I personally recommend is the Red Line Complete SI-1 Fuel System Cleaner. It’s known to work with almost 100$ accuracy and performance. Plus, it contains the highest quantity per dollar concentration of polyether amines (PEA), which are best known for their exceptional cleaning properties.

I recommend and love this product because it’s safe to use on a regular basis. Plus, the 15-ounce bottle it comes in is more than enough for your car’s tank size, making it a budget solution for car owners and auto-mechanics worldwide.

Plus, it doesn’t just clean your fuel system. This strong concentrated detergent is equipped with synthetic cylinder lubricants as well and goes beyond your fuel injectors and into improving your valves, combustion chambers, and other auto parts.

It’s also highly cost-effective and you’re bound to notice the difference right away. Test it out and you’ll realize the results are unambiguous!


  • Available as a 15 oz bottle
  • 100% efficiency in one treatment
  • Easy to use and apply
  • Accurate, high performance
  • Great value for money


  • Not suitable for certain types of vehicles

2. Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner

Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner

It can pretty much drive you nuts getting those crazy cylinder misfires. What are we looking for in a fuel injector cleaner? Something formulated to seriously prevent engine hiccups and prolong the life of your restored classic cars etc.

For 2019, Liqui Molly marked smiles to those who have faith and tried it. The majority of customer reviews stated how their car’s gas mileage improved.

Of course, results may vary with each product but this stuff is awesome. But who wouldn’t want a fuel treatment that provides the experience of being where you can feel that this is not only cleaning the injectors but as well as your fuel tank? It’s no surprise this brand became one of the most popular and profitable for auto-cleaning products.

Originally developed in Germany, Liqui Molly’s primary ingredient that gave it the high rates is Molybdenum disulfide. A high-grade and non-organic metal with the strength to withstand extreme heat up to 350 Celsius. What’s great about it is it doesn’t harm any critical seals or moving parts in your fuel system or engine.

Just a heads up, even the best products have their slight drawbacks if you aren’t careful enough. This Fuel Injector Cleaner is great at expelling carbon, moisture, and sulfur build-up.

So, it works pretty well in improving engine response-time upon accelerating or idling. However, it’s not recommended to use this product if you don’t regularly change your oil as advised as it may cause heavier clogging in both fuel injectors and engine oil.


  • Available as a 300 ml bottle
  • Full range with more than 4,000 items
  • Easy to use and apply
  • High performance and mileage
  • Great value for money


  • Not suitable for turbo GDI engines

3. Lucas 10013 Fuel Treatment

Lucas 10013 Fuel Treatment

On the silver spot is the Lucas 10013 Fuel Treatment, which goes beyond acting as a fuel injector cleaner. It’s a fuel conditioner as well, which means it thoroughly rejuvenates your fuel injection system thus improving your car’s overall performance.

Another reason to invest in this cleaner is that unlike other products in the market, it can clean up to 400 gallons of gasoline or diesel fuel. Already, this makes for a flexible and versatile choice among car owners.

Lucas’ formula is designed to eat away all the gunk left behind by the burning of fuel in your engine. It even burns away all the unnecessary emissions that come from your engine. From here, it cleans as well as lubricates your fuel system, including your car’s piston rings.

Furthermore, it improves the functionality of both your injectors and pumps. The 10013 Treatment is an overall solution to your fuel injection problems.

A preventive and longevity product that is economical with its value-size, and a great multitasker. What I love about this cleaner is not just its ability to get rid of the sediment sludge or its power to clean while lubricating.

I also admire its capability to neutralize low sulfur levels as well as boost your car’s mileage. Once you apply it, you’ll instantly experience smoother and more efficient driving.


  • Amazon’s Choice product
  • Available as a 1-gallon container
  • For automotive performance parts
  • Works in gas and diesel engines


  • None so far

4. Chevron 65740 Techron Concentrate Plus Fuel System Cleaner

Chevron 65740 Techron Concentrate Plus Fuel System Cleaner

Chevron is best known as one of the world’s widest fuel sellers. Ironically, they came up with their own line of fuel system cleaner that based on my experience, works as advertised. Since it came out, it never left the rankings of good products that it is made for.

This cleaner boasts of Techron — the brand’s patented technology that works as an additive to get the most out of your engine. It’s meant to restore your engine’s power and acceleration, restore fuel economy, reduce idle as well as eliminate knocking.

It ensures your fuel consumption remains stable for up to one year and works on malfunctioning fuel injectors in real-time. Overall, you might as well consider this the jack-of-all-trades when it comes to cleaning your fuel injection system.

The Chevron 65740 Techron Cleaner works great for when your engine refuses to start or when you’re dealing with a car that has had it rough for a very long time. What makes this one of the best in my books is that it’s versatile to use among a wide range of vehicle types.

It also works fast and is easy on the pocket. Plus, it’s made by one of the most trusted brands in the business. You can be sure this cleaner is nothing short of premium.


  • Amazon bestseller
  • Available in 12 and 20 oz bottles
  • Comes as a pack of 1 and 6
  • Suitable for various vehicle types


  • Not suitable for modern vehicle models

5. Gumout High Mileage Fuel Injector Cleaner

Gumout High Mileage Fuel Injector Cleaner

Gumout’s fuel injector cleaner is excellently formulated to get rid of carbon deposits in engines with over 75,000 miles so you can enjoy a restored engine performance and an improved fuel economy.

It might come in a small package, but it certainly rises to the occasion and packs a heavy punch. In fact, this cleaner will continuously lubricate your fuel injector system for the foreseeable future, so you don’t have to worry about carbon deposits and stubborn sediments.

Moreover, it will also provide superior protection for your engine block’s various parts and components, unclog your injectors and bring them back to the start of the assembly line when it comes to performance, durability, and longevity.

It’s oxygen sensor safe, and it’s also safe for turbocharged and supercharged vehicles. With this, you can easily refill a near-empty tank and run it up to about 3,000 miles before it needs any more replacement.

Basically, this cleaner will clean up your engines and keep it that way for a long time to come, lubricate your cylinders, reduce friction and heat, give you significant gains in horsepower and fuel economy, and just make your car perform so much better.


  • Available as a 6 oz bottle
  • Comes in 1 and 6 pack
  • Oxygen sensor safe
  • Good value for money


  • Not suitable for certain vehicle models

6. Royal Purple Max Clean Fuel System Cleaner and Stabilizer

Royal Purple Max Clean Fuel System Cleaner and Stabilizer

Finally, I also want to talk to you about the Royal Purple Max Cleaner, especially since it promises optimized protection for maximum engine performance. That’s not to mention the fact that Royal Purple has been, for a long time, a standard American home product when it comes to vehicle maintenance products.

That’s particularly because it’s a no-frills, just a results approach in giving you the performance that you need. It completely eradicates any problems with stalling and hesitation on the part of your engine and gives you an enhanced fuel economy.

It also works for a long period of time and stays in your car for a considerable period of time after usage, so you can enjoy that excellent performance for much longer. With this baby, you can experience the increased horsepower and lower harmful emissions.

Its state of the art, it deeply cleans and penetrates your fuel injector system, it revitalizes your carburetors, intake valves, and combustion chambers, and it does so much more. It even works for 2 cycles, 4 cycle, gasoline, and diesel engines, so there’s that.

With just a single-use, you get so much increase in performance of your engine and fuel, with superior resistance to corrosion, oxidation, destabilization, and premature spark plug fouling. All in all, a great and must-try product.


  • Available as a 20 oz spray
  • Comes in 1 and 6 pack
  • Highly versatile
  • Easy to use


  • Not suitable for certain vehicle models

Fuel Injector Cleaner Buying Guide

Regular fuel cleaning is the best way to keep your engine running smoothly, but of course, you can always make that process more efficient and enhance its positive effects by using specialized fuel injector cleaners.

The only question is, how do you know which is the best fuel injector cleaner for your vehicle? Take a look at these most important factors that you need to consider:

Type of fuel injector cleaner

The foremost common sort of fuel system cleaner is called a dissolvent. These items by and large use polyetheramine to break down carbon composites.

This is important because, after some time, the debasements within the fuel begin to build up in your car’s combustion chamber, specifically in the fuel injector. As such, dissolving this build-up into little pieces will permit them to be shot out through the exhaust system.

On the other hand, the much less common sort of fuel added substance could be a cleanser. Detergents work by activating chemicals that will constrain carbon stores to slide out of your engine’s fuel system. There’s a lot of debate over whether these really offer assistance in cleaning your fuel system, but the majority opinion seems to be that they do.

Important features

Aside from what type of fuel injector cleaner you want to go with, there are some other important considerations, such as the container type of the cleaner, how often you plan on using it, how and where you drive, the quality of the fuel you use, and how much mileage you want to get out of your vehicle.


Of course, as with any purchase, you need to take into account the price of the cleaner, which can largely vary from under ten dollars to over thirty dollars, depending on the brand, reliability, and performance. When it comes to this issue, it’s always safest to opt for mid range products.

Around twenty dollars is a good price point for cleaners that come in adequate amounts for car engines and from trusted brands as well.


In relation to what I’ve just mentioned, the brand of the cleaner is a dependable indicator of how reliable the product will be and how significant the increase in engine performance you can expect after using the injector cleaner.

The most popular brands out there for fuel injector cleaners include Chevron, Red Line, Royal Purple, and STP.


The general rule is, the foremost imperative ingredient in a fuel cleaner is polyetheramine, also called PEA. Items with this dynamic fixing are going to rapidly and viably clean out your framework for ideal execution and performance. This is often the key component in terms of chemically dissolving the carbon deposits in the engine.

Frequently asked questions about fuel system cleaners

Frequently asked questions about fuel system cleanersIf there are some things that are not quite clear to you when it comes to fuel injection cleaners, these FAQs below should help you out.

What is a fuel injection system?

The fuel injection system in your car is composed of fuel injectors that are meant to deliver gas to your motor properly. This system is a pivotal point in car production, since it provides the benefits of making cars a lot less polluting and a lot more fuel-efficient.

It is also a critical system all drivers must maintain and care for. Otherwise, fuel will not be burned efficiently and can be the cause of other car problems in the future. Much of the efficiency and functionality of a fuel injection system comes from how well the fuel injectors work. But what exactly are fuel injectors?

What are fuel injectors?

Fuel injectors have come a long way from their origins during the early 20th century. The very first fuel injection system running on gas was invented by Bosch and was first used for the Goliath GP700 back in 1952. Technological advancements finally eliminated the harmful carburetors and have paved the way for advanced electronic fuel injection engines (EFI).

Fuel injectors are electrically powered, computer-controlled valves that act like a syringe and inject more power into an engine. Of course, there is a system and structure to how much and how often these injectors put in fuel for your engine.

It has its own timetable and scale to efficiently use throughout your drive. It is particularly important in ensuring that your engine is using just the right amount of fuel and is burning it well.

How do fuel injectors work?

Fuel injectors are equipped with electric controls that often receive signals from the engine computer system. This computer will then interact with the injectors, determining the right amount and timing of fuel distribution.

Once the fuel reaches the injector through the pump in your tank, it will then spray a mist of gas into the cars’ motors. Once the gas mist reaches the manifold, it will then be brought to the engine where combustion takes place.

Why are diesel injectors more expensive than gasoline injectors?

Unlike gasoline injectors, diesel injectors are precision instruments, & operate in a very high-pressure environment along with its carefully engineered pattern. The vast majority of diesel engines will manage with injection pressures of around 2,000 bar.

It’s quite a high-tech order. It’s proficient in performing one to two pilot injections with precise dose, timing and a controlled pattern in each injection stroke. Other than that, diesel injectors are also made from exotic materials giving it a decent lifespan notwithstanding even the extreme environment.

Gasoline injectors are not as critical as diesel injectors. Injection pressure duties are just about 200 bar max for DI engines and lower for older designs. It doesn’t have as many requirements as diesel injectors since it injects the fuel into a low-pressure environment. The dose injection per stroke and pattern only needs sufficient atomization.

Why do fuel injectors need maintenance?

Just like any other component in your vehicle, you must take care of your fuel injectors as well. They are constantly exposed to high temperatures and the constant variations of gas quality put into it. The result? Your fuel injectors get clouded in dirt, wax, additives, carbons and other external elements overtime.

When you have poorly-kept fuel injectors, this leads to ineffective fuel-spraying patterns, improper flow of fuel in your engine as well as a direct negative impact on your gas mileage and vehicle performance. The next thing you know, your car has a hard time starting or worse, it won’t even start at all.

How can you solve fuel injector problems?

If it does happen that your fuel injectors become faulty, there are two primary ways to fix it: You can either use a fuel injector cleaner or replace it completely.

Today, we’re going to focus on the use of fuel injector cleaners, why cleaning is necessary and what the best fuel injector cleaners are out there. Let’s start by getting into the facts: Are fuel injectors nothing but hype?

How long do fuel injectors last?

It’s perhaps one of the most discomforting questions as it brings a lot of “Oh no’s.” Why do we say this? It’s because it should last as long as the cargoes. So why, then, is this even a matter for discussion?

Despite each of the best-engineered fuel injectors, it’s all about how it can handle real-world factors. Destructive driving circumstances, pollution in the air, dirt particles, and other unknowns can potentially shorten its life.

Make your fuel injectors live longer by changing your fuel filter according to recommendations.

This video explains how fuel injection works

Fuel injector cleaners: Fact or fiction?

Throughout my years in the auto business, I’ve discovered various ways of maintaining cars and providing quick, temporary fixes to some problems. One of which is the use of fuel injector cleaners.

There are a lot of cheaper brands out there that give fuel injector cleaning a bad name. However, if you do stick to the best brands that are out to efficiently breathe new life to your fuel injection system, then you will notice that this simple, quick and affordable fix really does its job.

The fact is fuel injector cleaners are necessary and effective, granted you invest in the right brand.

What are the benefits of using fuel injector cleaners?

Fuel injector cleaners work well in addressing initial fuel injection problems at their earliest stage. Problems like clogging can be fixed by using a cleaner on a regular basis. This makes it a fantastic fix for those who don’t want to end up with expensive car problems that will burn a deep hole in the pocket.

Those who regularly use fuel injector cleaners experience improvement in more ways than one. There’s a shorter cranking time, a smoother feel to how your car runs, a more powerful engine as well as better throttle response.

Just remember that the use of fuel injector cleaners depends on various situations. For example, those who live in frigid climates or don’t necessarily go for long-distance driving often will find that a bottle of cleaner every three thousand miles is more than enough. Furthermore, these cleaners are essential particularly to those who use gasoline that contains ethanol.


Fuel injectors are godsend and are a great alternative to fixing initial fuel injection problems. However, we’d like to remind you that car trouble is caused by a lot of things. There will always be more than one variable at play here.

The key is to conduct preventive measures as often as you can. Inspect your spark plugs, engine oil, filters and other parts as required. There’s also the model of your car that should be considered.

That’s why it pays to have a bit of know-how, learn more about your car and its components as well as keep in touch with your good ol mechanic to ensure you’re covering the right ground.

When it comes to the best fuel injector cleaner, I highly recommend the Red Line (60103) Complete SI-1 Fuel System Cleaner. It’s accurate, well concentrated, high performing, and is sure to clean your fuel injection system and beyond.

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  1. On Lucas brand, what does your con list mean when you say not suitable for unleaded?

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